What are 20 species that live in a pa pond

Sturdeons, Paddlefishes, Gars, Bowfines, Mooneye, Freshwater Eels, Herrings, Carps and Minnows, North American Catfishes, Smelts, Trouts and Salmons, Cods, Topminnows, Sticklebacks, Sculpins, Temperate Basses, Pikes and Mudminnows, Sunfishes, Perches and Darters, Drums and Croakers.

EXAMPLES Dunkleosteus, Sea Lamprey, Ohio Lamprey, Northern Lamprey, Shortnose Sturgeon, Atlantic Sturgeon, PaddleFish, American Book Lamprey, Mountain Brook Lamprey, Lake Sturgeon, Spotted Gar, Longnose Gar, Bowfin, Mooneye, American Eel, Blueback Herring, Alewife, Gizzard Shad, Hickory Shad, American Shed, Bluntnose Minnow, Central Stoneroller, Cutlips Minnow, Emerald Shiner, Rainbow Smelt, Pink Salmon, Stonecat, 

Yes he thought they should be left to chance why, because he thought that was the best thing to do